Modulation of stable auroral red /SAR/ arc occurrence rates

Astronomy and Astrophysics – Astronomy

Scientific paper

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Plasmapause, Red Arcs, Solar Activity Effects, Solar Cycles, Astronomical Photometry, Ion Production Rates, Northern Hemisphere, Systems Stability

Scientific paper

Data taken by the Pacific Northwest Laboratory photometer chain have been reviewed in a comprehensive search for stable auroral red (SAR) arc events during the period 1968-1978. Results of this search indicate both a seasonal and a solar cycle control of SAR arclike events. The occurrence rate of these events is shown to follow the solar activity cycle, though with a phase lag of 2-3 years. Further, a rather distinct summertime minimum of occurrence frequency is pointed out (northern hemisphere). Possible mechanisms for the existence of this effect are discussed.

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